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Enable/disable dropdownlist through a checkbox selection

<%@ Page Language="VB" AutoEventWireup="true" CodeFile="Default2.aspx.vb" Inherits="Default2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
    <script src="http://code.jquery.com/jquery-1.6.4.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(document).ready(function () {
            $("#chkEnable").click(function () {
                if (this.checked)
                    $('#ddlList').attr('disabled', 'disabled');                  
                else
                    $('#ddlList').removeAttr('disabled');
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:CheckBox ID="chkEnable" runat="server" Text="Enable/Disable" /><br />
        <asp:DropDownList ID="ddlList" runat="server">
            <asp:ListItem Text="Select" Value="-1">
            </asp:ListItem>
            <asp:ListItem Text="Option1" Value="1" />
            <asp:ListItem Text="Option2" Value="2" />
            <asp:ListItem Text="Option3" Value="3" />
        </asp:DropDownList>
    </div>
    </form>
</body>
</html>
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